Abstract:
PROBLEM TO BE SOLVED: To provide a radius arrangement of the continuous body guiding part in a curving continuous casting apparatus, with which under strict consideration of the maximum allowable elongation or the deformed value of the shell in the continuous body in the whole curving region of the continuous body guiding part, the vertical and curving section can be manufactured in the state of using the parts or a member and/or a module in the continuous body guiding part to be reconstructed, containing an arced mode. SOLUTION: In the radius arrangement of the continuous body guiding part, the curving zones 5, 6 are formed with a first region 5 at least comparatively concentrating the curving degree and a second region 6 having comparatively gentle curving degree, continued with the first region. The continuous body guiding part starts from the infinite radius in the vertical section 3 and has the curvature with a series of radiuses R1j gradually reduced in the first region 5 and curves with the curvatures R2i concentrating comparatively small in the second region 6 in comparison with the first region 5. A shifting adjusting zone 7 forming a shifting part between the curving zones 5, 6 and a main radius guiding zone 8, has the curvatures monotonously increased with the increase ΔR of the length of the radius forming this zone.
Abstract:
PROBLEM TO BE SOLVED: To improve a mold or continuous casting operation in a continuous casting method and its apparatus. SOLUTION: In a thermal control method for a copper plate facing to steel of a continuous casting mold regarding different casting speeds, different copper plate thickness, different casting sizes, different water amount and different water pressure respectively, the method is characterized in that selectable mold cooling water temperature at an outlet of the mold is constantly maintained unrelated to a casting speed. Temperature of the outlet of the mold is measured and controlled by a two way type valve having a short pipe between the outlet of the mold and an inlet of the mold and a bifurcated pipe providing for partial amount of the cooling water from the outlet of the mold to a heat exchanger. Hot cooling water at the outlet of the mold is mixed with cooled water at the outlet of the mold, and cooling water amount and pressure of at the outlet of the mold, in which cooling water temperature is controlled dependent on casting condition, is also controlled. Then, molding cooling water at the outlet of the mold is circulated through the mold by a pump station so as to maintain constant temperature.
Abstract:
The invention relates to a method for optimizing the cooling capacity of a continuous casting mold (1) for liquid metals, particularly for liquid steel, by homogenizing the thermal load (22) above the height of the continuous casting mold (1). According to the method, the cooling medium (5) is guided through a cross-sectional area of a large number of cooling medium channels (3) or cooling medium boreholes (4) running approximately parallel to the cast billet (9). The cooling medium cross-sectional areas between the mold entry (6) and the mold exit (7) are configured differently. In order to homogenize the thermal mold load (22), a smaller cross-sectional area sets the flow rate of the cooling medium (5), which is conducted from the top downward, inside the cooling medium channel (3) or inside the cooling medium borehole (4) higher in the upper area of the continuous casting mold (1) than in the lower area of the continuous casting mold (1) in which the flow rate is set lower by a larger cross-sectional area and/or the covering of the cooling medium is adjusted by a cross-sectional shape that varies from the top downward.
Abstract:
The invention relates to a device for cooling the copper plates (1.1) of a continuous casting ingot mould (1) for liquid metals, especially liquid steel, comprising an ingot mould coolant (2) which is guided in cooling channels. During the initial temperature rise to achieve a set casting speed or when said casting speed is exceeded for a deviating copper plate skin temperature (8), the copper plate skin temperature (8) is influenced, even when the casting speed is higher, in such a way that surface errors in the casting shell and/or cracks in the surface of the copper plates are prevented from occurring or occur in a significantly reduced manner by adjusting the copper plate skin temperature (8) at alternating casting speeds (6) of between 1 m / min and a maximum 12 m / min by means of quantitative correction of the amount of ingot mould coolant (4) and/or ingot mould coolant inflow temperature (5) according to the casting speed (6) and according to the thickness of the copper plates (9), to a desired constant value.
Abstract:
The invention relates to a method and device for continuously casting metal, particularly steel, whereby molten metal (6.1) is continuously cast in a cooled ingot mold with a casting speed (3) while forming a meniscus (7), and a cast product is continuously drawn out of the ingot mold in a direction of casting (3.1). The ingot mold, which has an ingot mold inlet (12) and an ingot mold outlet (8), is a water-cooled copper ingot mold having ingot mold cooling water channels (10.4) with a channel inlet and a channel outlet through which cooling water flows. Said water has an entry pressure p0 (15) at the channel inlet and an exit pressure p1 (15.1) at the channel outlet. The inventive method and device should be improved as to impede or prevent the high thermal load T of the ingot mold in the meniscus. To this end, the invention provides that, during a controlled adjustment of the water flow speeds in the ingot mold cooling water channels (10.4) and during a monitoring of the pressure loss DELTA p of the cooling water, the cooling water direction of flow (12) should correspond to the direction of continuous casting while forming a Nusselt layer that, at the height of the meniscus (19.1), is thinner than the Nusselt layer at the ingot mold outlet (19.2).
Abstract:
The invention relates to a device for cooling the copper plates (1.1) of a continuous casting ingot mould (1) for liquid metals, especially liquid steel, comprising an ingot mould coolant (2) which is guided in cooling channels. During the initial temperature rise to achieve a set casting speed or when said casting speed is exceeded for a deviating copper plate skin temperature (8), the copper plate skin temperature (8) is influenced, even when the casting speed is higher, in such a way that surface errors in the casting shell and/or cracks in the surface of the copper plates are prevented from occurring or occur in a significantly reduced manner by adjusting the copper plate skin temperature (8) at alternating casting speeds (6) of between 1 m/min and a maximum 12 m/min by means of quantitative correction of the amount of ingot mould coolant (4) and/or ingot mould coolant inflow temperature (5) according to the casting speed (6) and according to the thickness of the copper plates (9), to a desired constant value.
Abstract:
The invention relates to a method and a device for the continuous casting of slabs or ingots, in particular of thin slabs in a continuous casting installation. Said installation comprises a soft reduction section in a continuous casting guide under the mould. The soft reduction section contains pressure rollers and support roller (3, 4), which are continuously restrained in relation to one another, either individually or as a segment (1), by means of hydraulic cylinders (7, 7') and are restrained in a limiting manner by stops (30). The installation uses a hard-pressure restraining force in an area of the soft reduction section that has not yet completely solidified and a soft-pressure restraining force in an area of the soft reduction section that has completely solidified. Threshold and changeover values for the hard and soft-pressure are defined in the segment is restrained using hard-pressure, such a way that if the restraining force lies below the threshold or changeover value, and if the restraining force lies above the threshold or changeover value the segment is restrained using soft-pressure.
Abstract:
The invention relates to a process for producing thin slabs and to a continuous casting installation for this purpose, having a laterally adjustable mold into which an immersion nozzle protrudes, and in which there is opposite a larger crowned cross section on the charging side a cross section on the strand outlet side which is small and identically crowned in the central region, and having pairs of supporting and guiding rollers which follow the mold and have a caliber adapted to the emerging crowned strand. In this case, a) the immersion nozzle (11) has a spade-shaped mouth (13) with a maximum thickness (d) corresponding to d=0.3 to 0.5xDE, where DE is the distance between the mold broad faces (21) in the charging region, b) the broad-face parts (21) have at least in the shadow region of the immersion nozzle (11) central parts (23) which are arranged parallel to one another according to their contour lines, c) the broad-face plates (21) are designed at least in the adjusting region of the narrow-face plates (22) as planar side surfaces (24, 25), d) the planar side surfaces (24, 25) are arranged such that they move conically toward each other in the direction of the narrow faces (22), e) the planar-surface central plate (23) is connected to the planar-surface side surfaces (24, 25) by transitional parts (26, 27), f) the transitional parts (26, 27) taper toward each other in the form of a wedge and the wedge tip (28) ends at a distance (a), measured from the upper edge of the mold, with a=0.5 to 0.8xL, where L=the length of the mold, and g) the supporting and guiding rollers (41) have a contour which corresponds to the planar-surface central plate (23) and the planar side plates (24, 25) of the mold broad faces (21) in the region of the mouth of the mold.
Abstract:
The invention relates to a device for cooling the copper plates (1.1) of a continuous casting ingot mould (1) for liquid metals, especially liquid steel, comprising an ingot mould coolant (2) which is guided in cooling channels. During the initial temperature rise to achieve a set casting speed or when said casting speed is exceeded for a deviating copper plate skin temperature (8), the copper plate skin temperature (8) is influenced, even when the casting speed is higher, in such a way that surface errors in the casting shell and/or cracks in the surface of the copper plates are prevented from occurring or occur in a significantly reduced manner by adjusting the copper plate skin temperature (8) at alternating casting speeds (6) of between 1 m / min and a maximum 12 m / min by means of quantitative correction of the amount of ingot mould coolant (4) and/or ingot mould coolant inflow temperature (5) according to the casting speed (6) and according to the thickness of the copper plates (9), to a desired constant value.
Abstract:
The invention relates to a device for cooling the copper plates (1.1) of a continuous casting ingot mould (1) for liquid metals, especially liquid steel, comprising an ingot mould coolant (2) which is guided in cooling channels. During the initial temperature rise to achieve a set casting speed or when said casting speed is exceeded for a deviating copper plate skin temperature (8), the copper plate skin temperature (8) is influenced, even when the casting speed is higher, in such a way that surface errors in the casting shell and/or cracks in the surface of the copper plates are prevented from occurring or occur in a significantly reduced manner by adjusting the copper plate skin temperature (8) at alternating casting speeds (6) of between 1 m/min and a maximum 12 m/min by means of quantitative correction of the amount of ingot mould coolant (4) and/or ingot mould coolant inflow temperature (5) according to the casting speed (6) and according to the thickness of the copper plates (9), to a desired constant value.